Fix tests

Author: elasticsearchmachine

x-pack/plugin/esql/qa/testFixtures/src/main/resources/knn-function.csv-spec

@@ -229,7 +229,7 @@ required_capability: knn_function_v5
 
 from colors metadata _score
 | eval composed_name = locate(color, " ") > 0 
-| where knn(rgb_vector, [128,128,0], {"min_candidates": 100}) and composed_name == false
+| where knn(rgb_vector, [128,128,0], {"k": 100}) and composed_name == false
 | sort _score desc, color asc
 | keep color, composed_name
 | limit 10

x-pack/plugin/esql/src/internalClusterTest/java/org/elasticsearch/xpack/esql/plugin/KnnFunctionIT.java

@@ -113,16 +113,16 @@ public void testKnnDefaults() {
         }
     }
 
-    public void testKnnOptions() {
+    public void testKnnKOverridesLimit() {
         float[] queryVector = new float[numDims];
         Arrays.fill(queryVector, 0.0f);
 
         var query = String.format(Locale.ROOT, """
             FROM test METADATA _score
-            | WHERE knn(vector, %s)
+            | WHERE knn(vector, %s, {"k": 5, "min_candidates": 20})
             | KEEP id, _score, vector
             | SORT _score DESC
-            | LIMIT 5
+            | LIMIT 10
             """, Arrays.toString(queryVector));
 
         try (var resp = run(query)) {